Commutator brush holder



M. J. NEUNER COMMUTATOR BRUSH HOLDER June15, 1948.

2 Sheets-Sheet 1 Filed Sept. 2, 1944 INVENTOR. llhriin INeunen BY ATTORNEY June 15, 1948. M. J. NEUNER 2,443,255

COMMUTATOR BRUSH HOLDER Filed Sept. 2, 1944 2 Sheets-Sheet 2 IN V EN TOR.

B Martin llVewz r ATTORNEY Patented June 15, 1948 UN ITZED is ICE 1 GOMMUTAQOR BRUSH HOLDER a .;Martin. J. Neuner, .Fairview, N.- J., assignoiz. l-to Bendix, AviatiolilCoi-poration, \Teterboro, N'. 1.,

a corporation ofDelaware r Application :September 2, 1944gSeria1 'No.i552;454

10. .lClaims. 2 l slyly: invention relates:-to--commutator thrush ,WhOldQIS and-eparticularly to-meansfor-varyingthe spsessure applied to commutator brushes.

.One of rthez objects -oi .my' inventionf is to pro vid e pressure y-regulating means which is so constructed and arranged whereby the pressurerapplied to the commutator-brushes of an electrical 1 (device may-be readily: @Varied to efiectweflicient i nperatiomotthetdevice.

e Another obiectt, of my\ invention is to provide meansioftheioregoing. des cribed character which his sooonstructedland.arranged whereby. thee-pres- .w sure applied-tattle ,brushesmay -be adjusted to a .wrelatively minutadegreeaftoprolong the effective .use ofrtheebrushesand .to .minimize wear of the rcommutator.

mAnimpontantmbject ofmy-invention is .toprowide means. of. the character-described which is csimple intconstruction, durable in use,:efncient in 'oper.ation-: and-economical tin -manufacture.

With i the above- :and other objects in view, as will. hereinafter appear, the invention consists in sthe eombination, and'ar-rangement of parts hereinafter set forth and illustrated in'theraeccom- .-panyi ngizclrawingst from whichthewseverat feaa zituresi joft ethei invention 1* tand thewadvantages matteinedtthereby wiliwbe readily. understood-by hoseskilledjnthemrt.

ifleferringeto the gd-nawinga wherein" like rref- '-:;;erence.=-chazactersrdesignatealike} parts; through-i;

stout theseyerai views i Eigu-re 1; is a tperspective view. of;- imy invention wand; illustrates r thezsamer inteonjunution with a w --.eommutatorsand. brush assembly of an electrical itdevice.

iv'iewsiof the-'itoothedzendx of: the asleeveiaandythe 12112011BlfldiSCiOSBdiifilEiEU-DES i and 6.

f'fihe :presentninventiori is? illustrated: 'in; nonrjimetiomwithithe .commutatortl 0 rand insulating- :ning v I l iohamelectrimmotor fofctheriengine. starter T; type; the" ringed was: isnustomarm beinglsecured .tman'cehdspartitionror wallcofnthermotor;oasing "'flahdiiihaflngi tattanhectil :kheretoe aseset: 'of: 1: "brush lcebxacketsi'l 2:2:msmuchszasstherhraoketszr l 2 are of.

i..aan-.identical construction; a detailed \description ftn'dsgillliStFHtiOllwOf? one,= together-with its associated-components forming part-0f the-present invention; will suflice.

I: As --depictedl in v the. rirawings, the.- :bracket l2 houses a, pairtot brushes l3whioh areiequipped with thensual lead wires 4 4 and L-shaped lifters -15, each of theilatter zhaving a flange l6 coacting with the adjacentwendv face .l'laoi the brush to *slidablymaintain therebetween the outer :rolled cenddll of. a brush actuating arm-J9. -.Adjacent the? ring,'theend oi-the bracketel 2 is formed with a laterallyrextendingtear -to which is fixed the l .innerend roi a shaft =2lxhaving mounted thereon asleeve 22 formed ,withan elongated 1 slot -23.

. -.Ro.ta-tably mounted on-the-sleeveare a pair of spring retainers or- .carriers 524 each comprising l aspair of-;spaced centrally apertu1'ed .-discs -25. :through which: the lsleeve.extends;andwhich discs --2 5;. are, secured-r together by a bridge. 26

1:integrally tconnected-tothe opposite end of the arm I 9.

1 Each carrier hasdisposedtherein, between the discs azflat type coil spring 21 havin its inner: end 28anchored in the slot -23- and its outer end formed with ahook -29,-.embrac ing the v bridge -26 to-transmit-tension to-the-brush-rl3-through the arm I As-illustrated inthe drawings,- one -of the discs-25 voiweaoh carrier is -fashionedwith finger 30- adapted-:tobe engaged by" means, (not shown) to; efiect -paitial rotationof i the carriers in a-ldirection to disengage th rbrushesfrom the vqoommutatorrto.permit the commutator to -be 1 manually or. otherwise rotated when-desired.

1- Primarily, the present invention is directed to controlling or-v regulating the-2 pressure applied to thebrushes in theirlower orcommutator engagwing positions: and-in a precise manner whereby the pressure may be varied to within adelatiVBly minute degree, it being understood that reducing the 'pressure appl-ied to: thelbrushes comparable wwith eflicient operation of the :motor', ":serves to prolong the-.rl-ife x and effectiveness of: the; brushes with-. resultantreduotion lin' t he wear-0t the nommutator. :As illustratedmin Eigures L to 4: inclu- ..7 sive, :means isvprovided.-ior-&regu1ating1th .:pres- .;sure: qappl-ieduto the r-brusheswanm which: means toomprvises fthe shaitr Zhandthe sleeve 142;. the :slatter having. ii'xed v toi-z'or formed-- With-its inner end adjacent =-the 'ean-n2!l, :an-internaL-gearor .inte-riorly soothed-iannular tease 3 l; in which is inornially-rmaintainedr and :in fixed-relation: therewith-,- awpinionrorstoothedcollar132,-the ;teeth 33 ;of; the iatte v intermeshing'. with; the: teeththeecasen it betng,-11mierstopd.'that thercaseten'd collar are provided with a multiplicity of relatively small and closely spaced teeth whereby rotative adjustment of the sleeve 22 with relation to the shaft 2| may be effected in small steps. By axially moving the sleeve 22 with respect to the shaft 2|, the sleeve may be rotated to vary the tension of the springs to a desired degree and to maintain the same upon reverse axial movement of the sleeve and intermeshing of the teeth 33 and 34.

The outer end of the shaft extends beyond the outer end of the sleeve and is formed with a circumferential groove 35 in which is disposed a split resilient removable ring 36 for precluding axial movement of the sleeve relative to the shaft .thesleeve 22, the teeth of said case and end intermeshing to preclude relative rotation of the shaft and sleeve as in the instance of the embodiment disclosed in Figures 1 to 4 inclusive.

In order to facilitate application of the ring 36 into the groove 35, the outer end face of the shaft is provided with a conical recess 56 for receiving therein the conical end 5| of a spreading tool 52 having a cylindrical portion 53 of a diameter coincident with the diameter of the shaft and defining a shoulder or end face 54, adjacent the conical portion, for butting engagement with the outer end face of the shaft, whereby, an expanded ring 36, contained on the cylindrical portion 53, may be moved over the outer end of the shaft and snapped into the groove 35 as clearly illustrated in Figure 5 of the drawings. Without further elaboration the foregoing will so fully explain the invention that others may, by applying current knowledge, readily adapt the same for use under various conditions of service. Moreover, it is not indispensable that all the features of the invention be used conjointly since they may be employed advantageously in various combinations and sub-combinations.

fined to the therein described use therefore as it may be utilized for any purpose to which it is adaptable. It is therefore to be understood that the invention is not limited to the specific construction as illustrated and described as the same is only illustrative of the principles of operation, which are capable of extended application in various forms, and that the invention comprehends all construction within the scope of the appended claims.

What is claimed is:

1. In combination, a housing equipped with a movable brush, and pressure applying means for said brush comprising a shaft element fixed to said housing, a sleeve element mounted on said shaft element, one of said elements being provided with an interiorly toothed case and the other being provided with a toothed disc disposed in said case and having its teeth intermeshing with the teeth of said case to preclude relative rotation of said elements, a carrier rotatably mounted on said sleeve element and having an arm engaging said brush for applying pressure thereto, a spring disposed in said carrier and having its 'ends connected to said sleeve and said arm' respectively for maintaining the latter in 4 engagement with said brush, said disc and case being axially separable to permit rotative adjustment between said elements to vary the tension of said spring.

2. In combination, a housing equipped with movable brush, and pressure applying means for said brush comprising a shaft element fixed to said housing, a sleeve element mounted on said shaft element, one of said elements being provided with an interiorly toothed case and the other being provided with a toothed disc disposed in said case and having its teeth intermeshing with the teeth of said case to preclude relative rotation of said elements, a carrier rotatably mounted on said sleeve element and having an arm engaging said brush for applying pressure thereto, a spring disposed in said carrier and having its ends connected to said sleeve and said arm respectively for maintaining the latter in engagement with said brush, said disc and case being axially separable to permit rotative adjustment between said elements to vary the tension of said spring, and removable 'means carried by one of said elements for precluding'axial displacement of the other element relative there- 3. In pressure applying means for a brush movable within a housing, a shaft element adapted to be fixed to saidhousing, asleeveelement on said shaft element, one of said elements being provided with an interiorly toothed case and the other being provided'with a toothed disc disposed in said case and having itsteeth intermeshing with the teeth of said case to'preclude relative rotation of said elements, 'a carrier rotatably mounted on said sleeve element andhaving an arm for engaging said brush to apply pressure thereto, a spring disposed in said carrier and having its ends connected to'said sleeve and said arm respectively for maintaining the latter in engagement with said brush, said disc andcase being axially separable to permit rotative adjustment between said elements to vary the tension of said spring.

4. In pressure applying means for a brush'inovable within a housing, a shaft element adapted to be fixed to said housing, a sleeve element mounted on said shaft element, one of said elements being provided with an interiorly toothed case and the other being provided with a toothed disc disposed in said case and having its teeth intermeshing with the teeth of said case" to preclude relative rotation of said elements, a carrier rotatably mounted on said sleeve element and having an arm for engaging said brush'to apply pressure thereto, a spring disposed in said carrier and having its ends connected to said sleeveand said arm respectively for'maintaining the latter in engagement with said brush, said disc and case being axially separable to permit'rotative adjustment between said elements to vary the tension of said spring, and removable means carried by one of said elements for precluding axial displacement of the other element relative thereto. 4

5. In combination, a housing equipped with a movable brush, and pressure applying means for said brush comprising a shaft fixed to said housing and provided with a toothed disc, a sleeve mounted on said shaft and provided with an interiorly toothed case receiving said disc and having its teeth intermeshing with the teeth of said disc to preclude rotation therebetween, a carrier rotatably mounted on said sleeve and having an arm engaging said brush for applying pressure thereto, a spring disposed in said carrier and having its ends connected to said sleeve and said arm respectively for maintaining the latter in engagement with said brush, said sleeve being axially movable on said shaft to separate said case and disc to permit rotation of said sleeve on said shaft to vary the tension of said spring.

6. In combination, a housing equipped with a movable brush, and pressure applying means for said brush comprising a shaft fixed to said housing and provided with a toothed disc, a sleeve mounted on said shaft and provided with an interiorly toothed case receiving said disc and having its teeth intermeshing with the teeth of said disc to preclude rotation therebetween, a carrier rotatably mounted on said sleeve and having an arm engaging said brush for applying pressure thereto, a spring disposed in said carrier and having its ends connected to said sleeve and said arm respectively for maintaining the latter in engagement with said brush, said sleeve being axially movable on said shaft to separate said case and disc to permit rotation of said sleeve on said shaft to vary the tension of said spring, and removable means carried by one of said elements to precluding axial displacement of the other element relative thereto.

7. In pressure applying means for a brush movably mounted in a housing, a shaft adapted to be fixed to said housing and provided with a toothed disc, a sleeve mounted on said shaft and provided with an interiorly toothed case receiving said disc and having its teeth intermeshing with the teeth of said disc to preclude rotation therebetween, a carrier rotatably mounted on said sleeve and having an arm for engaging said brush for applying pressure thereto, a spring disposed in said carrier and having its ends connected to said sleeve and said arm respectively for maintaining the latter in engagement with said brush, said sleeve being axially movable on said shaft to separate said case and disc to permit rotation of said sleeve on said shaft to vary the tension of said spring.

8. In pressure applying means for a brush movably mounted in a housing, a shaft adapted to be fixed to said housing and provided with an interiorly toothed case, a sleeve mounted on said shaft and provided with a toothed end section disposed in said case and having its teeth intermeshing with the teeth of said case to preclude rotation therebetween, a carrier rotatably mounted on said sleeve and having an arm for engaging said brush for applying pressure thereto, a spring disposed in said carrier and having its ends connected to said sleeve and said arm respectively for maintaining the latter in engagement with said brush, said sleeve being axially movable on said shaft to separate said end section from said case to permit rotation of said sleeve on said shaft to vary the tension of said spring.

9. In pressure applying means of the type provided with a carrier equipped with an arm for exerting pressure on a brush movable within a housing and with the carrier having a spring connected to the arm for exerting said pressure; a pair of telescopically arranged members adapted to extend through said carrier and having end sections formed with intermeshing teeth for precluding relative rotation of said members, one of said members adapted to be connected to said spring to vary the tension thereof upon rotation relative to the other member, one of said members being axially movable relative to the other to demesh said teeth and permit rotative adjustment of said members.

10. In combination, a housing equipped with a movable brush, and pressure applying means for said brush comprising a shaft element non-rotatively fixed to said housing, a sleeve-like element mounted on said shaft element, one of said elements being provided with a case having interior tooth means and the other being provided with a member disposed in said case and having tooth means, the tooth means of said elements intermeshing with each other to prevent rotation of the elements relative to each other, a carrier rotatably mounted on said sleeve-like element and having an arm engaging said brush for applying pressure thereto, and spring means connected between said sleeve and said arm for maintaining the arm in engagement with the brush, said member and case being adapted for movement including rotation relative to each other to vary the force imposed by said spring means relative to the brush.

MARTIN J. NEUNER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,396,451 Merk Nov. 8, 1921 1,428,342 Nies Sept. 5, 1922 2,234,695 Hanna Mar. 11, 1941 FOREIGN PATENTS Number Country Date 522,067 France Mar. 21, 1921 Certificate of Correction Patent No. 2,443,266. June 15, 1948.

MARTIN J. NEUNER It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Column 4, line 30, claim 3, before on insert mounted; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 31st day of August, A. D. 1948.

THOMAS F. MURPHY,

Assistant Commissioner of Patents.

Certificate of Correction Patent No. 2,443,266. June 15, 1948.

MARTIN J. NEUNER It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows: Column 4, line 30, claim 3, before on insert mounted; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice.

Signed and sealed this 31st day of August, A. D. 1948.

THOMAS F. MURPHY,

Assistant Uomqm'asioner of Patents. 

